The Pullus Jinx (Pullus) is a transforming jinx used to transfigure the target into a chicken or a goose; in particular, Erklings appear to be rather vulnerable to this jinx.
This jinx was used in 1754 by an unknown wizard on Silvio Astolfi, an Italian broom racer.
Pullus is Latin for the young of animals, particularly chickens (i.e. chicks).
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